/***************************************************************************
 # Copyright (c) 2015-21, NVIDIA CORPORATION. All rights reserved.
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 # modification, are permitted provided that the following conditions
 # are met:
 #  * Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 #  * Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 #  * Neither the name of NVIDIA CORPORATION nor the names of its
 #    contributors may be used to endorse or promote products derived
 #    from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 # PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 **************************************************************************/
#include "stdafx.h"
#include "BlendState.h"
#include "FBO.h"

namespace Falcor
{
    BlendState::SharedPtr BlendState::create(const Desc& desc)
    {
        return SharedPtr(new BlendState(desc));
    }

    BlendState::Desc::Desc()
    {
        mRtDesc.resize(Fbo::getMaxColorTargetCount());
    }

    BlendState::~BlendState() = default;

    BlendState::Desc& BlendState::Desc::setRtParams(uint32_t rtIndex, BlendOp rgbOp, BlendOp alphaOp, BlendFunc srcRgbFunc, BlendFunc dstRgbFunc, BlendFunc srcAlphaFunc, BlendFunc dstAlphaFunc)
    {
        if(rtIndex >= mRtDesc.size())
        {
            reportError("Error when setting blend state RT parameters. Invalid render-target index " + std::to_string(rtIndex) + ". Must be smaller than " + std::to_string(mRtDesc.size()) + ".");
            return *this;
        }
        mRtDesc[rtIndex].rgbBlendOp = rgbOp;
        mRtDesc[rtIndex].alphaBlendOp = alphaOp;
        mRtDesc[rtIndex].srcRgbFunc = srcRgbFunc;
        mRtDesc[rtIndex].dstRgbFunc = dstRgbFunc;
        mRtDesc[rtIndex].srcAlphaFunc = srcAlphaFunc;
        mRtDesc[rtIndex].dstAlphaFunc = dstAlphaFunc;
        return *this;
    }

    BlendState::Desc& BlendState::Desc::setRenderTargetWriteMask(uint32_t rtIndex, bool writeRed, bool writeGreen, bool writeBlue, bool writeAlpha)
    {
        if(rtIndex >= mRtDesc.size())
        {
            reportError("Error when setting blend state RT write-mask. Invalid render-target index " + std::to_string(rtIndex) + ". Must be smaller than " + std::to_string(mRtDesc.size()) + ".");
            return *this;
        }
        mRtDesc[rtIndex].writeMask.writeRed = writeRed;
        mRtDesc[rtIndex].writeMask.writeGreen = writeGreen;
        mRtDesc[rtIndex].writeMask.writeBlue = writeBlue;
        mRtDesc[rtIndex].writeMask.writeAlpha = writeAlpha;
        return *this;
    }

    FALCOR_SCRIPT_BINDING(BlendState)
    {
        pybind11::class_<BlendState, BlendState::SharedPtr>(m, "BlendState");
    }
}
